in the users and computers MMC, click view\advanced features.
Then go to the properties of the user or mailbox you want to hide, and go Exchage advanced tab. Check teh box that says "Hide from exchange

In this video we show how to create a User Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Recipients >> Mailb…

In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Mail Flow…